I have watched a lot if Dave Tate videos....arched back with upper back and butt being the contract points to bench, shoulder blades pinched together, feet solid on the ground pushing through heels, wrists directly over elbows with bar over wrist, hands slightly wider than shoulders, and bar lowered to just below nipples....it is even painful to bring an empty bar to my chest. The damage is done. If i go lower than about 2" off my chest my shoulder hurts for days.
I trust my sports medicine doctor over one size fits all bench press advice. Body mechanics makes a big difference....